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An investigation is underway to establish the circumstances of the tragedy and post mortem exams will also be carried out.

The emergency services said in a statement: "The medical ambulance came right away, but we could not do anything."

Eyewitness Diego Vitagliano said: "I saw a child run crying, I did not think I was facing the worst tragedy of my life, I'm a father too.

The tragedy occurred near the town of Pozzuoli (Image: LightRocket)

"They pulled out two bodies, then pulled us away. I continue to think about that family and that poor baby crying and asking for help."

Vincenzo Figliolia, mayor of the nearby town of Pozzuoli, said: "I am shocked for what happened inside the Solfatara volcano, deep pain for the imminent tragedy involving three tourists, and I express my closeness from the community of Pozzuoli to the victims' family."